EP0493994A1 - Apparatus for igniting a bed of mixed materials such as mineral and coke - Google Patents

Apparatus for igniting a bed of mixed materials such as mineral and coke Download PDF

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Publication number
EP0493994A1
EP0493994A1 EP91403348A EP91403348A EP0493994A1 EP 0493994 A1 EP0493994 A1 EP 0493994A1 EP 91403348 A EP91403348 A EP 91403348A EP 91403348 A EP91403348 A EP 91403348A EP 0493994 A1 EP0493994 A1 EP 0493994A1
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EP
European Patent Office
Prior art keywords
burners
mixing bed
bed
mixture
hood
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91403348A
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German (de)
French (fr)
Inventor
Jean-Claude Dieuloufet
Gérard Griffay
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Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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Publication date
Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0493994A1 publication Critical patent/EP0493994A1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B9/00—Stoves for heating the blast in blast furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines

Definitions

  • the present invention relates to a device for igniting a bed of mixture driven in movement, in particular a mixture comprising ore and coke, the combustion of which produces agglomeration of the ore.
  • the ore transformation process in the steel industry notably includes a stage of agglomeration of iron ore which mainly consists of pre-baking it before loading it into a blast furnace.
  • This precooking is obtained by combustion of a mixture mainly containing ore and coke.
  • the mixture is driven in movement towards a grinder then, towards the blast furnace.
  • the combustion reaction of the mixture is sufficiently exothermic that once initialized when the mixture is ignited, it maintains itself by means of a suitable oxygen supply.
  • An ignition device commonly called an ignition hood, is placed upstream of the ignition chain and initiates the combustion reaction on the surface of the mixing bed. The combustion then propagates in the thickness of the mixing bed as it moves, so that before reaching the mill, the complete agglomeration of the ore is carried out.
  • the ignition hood heats the mixing bed by radiating the walls over its entire width and passing through, the surface of the mixing bed gradually reaches the combustion temperature.
  • a burner flame does not have a homogeneous temperature over its entire length and as two burner flames arranged opposite each side of the mixing bed, overlap in the center of the mixing bed, the temperature of the surface thereof is heterogeneous according to its width.
  • any irregularities in thickness of the mixing bed also lead to a poor distribution of the temperature on the surface of the mixing bed.
  • the ignition is accelerated and the combustion reaction is propagated by circulating air perpendicular to the surface of the mixing bed, the oxygen in the air thus supplying the combustion reaction.
  • the ignition device ensuring in particular the evaporation of the water from the mixture, it creates spaces in the mixture allowing the circulation of air.
  • Too high a temperature of the mixture causes its vitrification and the loss of its air permeability, preventing this air circulation.
  • too low a temperature of the mixture does not make it possible to obtain agglomeration of the ore. It is therefore important to obtain a uniform and well-controlled temperature over a defined thickness, which the known device does not achieve.
  • the circulation of the hot gases which is perpendicular to the surface of the mixing bed is in opposition to the movement of ejection of the gases from the burners which takes place parallel to the surface of the mixing bed. In this way, the gas flows from the burners through the mixture are heterogeneous.
  • the invention proposes an ignition device d '' a bed of mixture driven in movement, in particular of a mixture comprising iron ore and coke, the combustion of which produces the agglomeration of the ore, of the type comprising a hood, under which are burners supplied with fuel and air , the hood covering the mixing bed over its entire width and over a length suitable for heating it to the ignition temperature, the burners having axes oriented substantially perpendicular to the surface of the mixing bed, characterized in that that the fuel flow and the air flow are adjustable separately and individually for each burner.
  • FIG. 1 shows an ignition device 10 for a mixing bed 12 which moves in the direction indicated by the arrows F1 while being carried by a conveyor 13.
  • the mixture mainly comprises iron ore, coke, the combustion of which provides the heat energy necessary for the agglomeration of the ore, water and lime.
  • the mixing bed 12 has, for example, a width of 5 meters, a thickness of 0.5 to 0.7 meters and a length of 80 meters, between the ignition device 10 and the grinder, in relation to time propagation of the combustion reaction in the thickness of the mixture.
  • the ignition device 10 comprises a hood 14.
  • the hood comprises at least one row of burners 16 having axes oriented substantially perpendicular to the surface of the mixing bed 12.
  • Each burner 16 comprises a body 17, a gas supply duct 18 and an air supply duct, not shown in the figures for reasons of clarity.
  • a hot gas ejection cone 19 is shown diagrammatically by two dashed lines under each burner body.
  • these burners 16 are arranged in a line in three equidistant rows spaced at most one meter apart, extending over the entire width of the mixing bed 12, one burner per row being shown.
  • Burners are preferably used with a rapid gas ejection speed, that is to say greater than 80 m / s.
  • each row of burners has twenty burners of the type described above, which makes a total of sixty burners arranged under the hood.
  • the hood 14 is made, for example, of refractory material.
  • the ignition device 10 and the mixing bed 12 are carried by a masonry structure 21.
  • FIG. 2 illustrates the way in which the combustion reaction, which was initiated by the ignition device 10 on the surface of the mixing bed 12, propagates along the thickness of the latter, as it moves towards the crusher.
  • a first zone 22 corresponds to the part of the mixture in combustion
  • a second zone 24 corresponds to the agglomerate of ore obtained after the combustion of the mixture
  • a third zone 26 corresponds to the mixture not yet reacted.
  • FIG. 2 shows a start of propagation of the combustion reaction which has been initialized on the surface of the mixing bed 12, at the outlet of the ignition device.
  • FIG. 2 shows that the combustion reaction has reached the underside of the mixing bed and that the mixture has been transformed into agglomerated ore intended to supply the blast furnace.
  • combustion takes place optimally, for example, for a temperature between 1100 ° and 1250 °.
  • the device according to the invention makes it possible in particular to control the homogeneity of the ignition temperature on such a strip.
  • each burner essentially heats a sector of the surface of the mixing bed 12 delimited by the gas ejection cone and all of the burners heats as many sectors as necessary to bring the mixture to its temperature d on the entire width of the bed.
  • the individual adjustment of the gas flow rate of each burner 16 allows temperature control, sector by sector, and thus makes it possible to obtain a relatively uniform temperature at the surface of the mixing bed 12.
  • this possibility of individual adjustment makes it possible to adapt the heating to a mixing bed whose cross section has a variable thickness, for example in the case of a V-shaped section such that the mixing bed is thicker. in the center only on its edges, or vice versa.
  • the ejection of combustion products and the circulation of hot gases through the mixing bed are in the same direction, so there is no disturbance and thus optimizes the consumption of oxygen and gas on the burners . This ensures a uniform temperature of the gases entering the mixing bed.
  • burners 16 of the fast gas ejection speed type better control of the heat and gas flows is provided by the rapid ejection of the gases which causes the recirculation of the fumes and the constitution under the hood d '' a homogeneous hot zone.
  • the better control of heat and gas flows provided by the ignition device according to the invention reduces the length of the hood by up to 50% or more. Indeed, the ignition of the mixing bed is obtained more quickly in the case of a device according to the invention than in the case of the known device described at the start, at the same speed of movement of the mixing bed.

Abstract

The invention relates to an apparatus (10) for igniting a mixing bed (12) driven in motion, particularly for a mixture comprising iron ore and coke, the combustion of which produces sintering (briquetting) of the ore. This apparatus, comprising a hood (14), beneath which burners (16) are arranged and which is traversed by the mixing bed (12), is characterised in that the burners (16) have axes oriented substantially perpendicularly to the surface of the mixing bed (12), each burner (16) having a gas flow and an air flow which can be adjusted individually, the burners being of the rapid gas ejection velocity type. <IMAGE>

Description

La présente invention concerne un dispositif d'allumage d'un lit de mélange entraîné en mouvement, notamment d'un mélange comprenant du minerai et du coke dont la combustion produit l'agglomération du minerai.The present invention relates to a device for igniting a bed of mixture driven in movement, in particular a mixture comprising ore and coke, the combustion of which produces agglomeration of the ore.

Le processus de transformation du minerai, dans la sidérurgie, comprend notamment une étape d'agglomération du minerai de fer qui consiste principalement en une précuisson de celui-ci avant son chargement dans un haut-fourneau.The ore transformation process in the steel industry notably includes a stage of agglomeration of iron ore which mainly consists of pre-baking it before loading it into a blast furnace.

Cette précuisson est obtenue par combustion d'un mélange contenant principalement du minerai et du coke.This precooking is obtained by combustion of a mixture mainly containing ore and coke.

Le mélange, généralement disposé en lit, est entraîné en mouvement vers un broyeur puis, vers le haut-fourneau.The mixture, generally arranged in a bed, is driven in movement towards a grinder then, towards the blast furnace.

La réaction de combustion du mélange est suffisamment exothermique pour qu'une fois initialisée à l'allumage du mélange, elle s'entretienne d'elle-même moyennant une alimentation adaptée en oxygène.The combustion reaction of the mixture is sufficiently exothermic that once initialized when the mixture is ignited, it maintains itself by means of a suitable oxygen supply.

Un dispositif d'allumage, appelé couramment hotte d'allumage, est placé en amont de la chaîne d'allumage et initialise la réaction de combustion à la surface du lit de mélange. La combustion se propage ensuite dans l'épaisseur du lit de mélange au fur et à mesure que celui-ci se déplace, de façon qu'avant d'atteindre le broyeur, l'agglomération complète du minerai soit réalisée.An ignition device, commonly called an ignition hood, is placed upstream of the ignition chain and initiates the combustion reaction on the surface of the mixing bed. The combustion then propagates in the thickness of the mixing bed as it moves, so that before reaching the mill, the complete agglomeration of the ore is carried out.

Il est connu d'utiliser une hotte d'allumage sous laquelle des brûleurs sont disposés de part et d'autre des bords latéraux du lit de mélange de façon à éjecter leurs produits de combustion horizontalement, c'est-à-dire parallèlement à la surface du lit de mélange, de sorte que les flammes viennent lécher la surface du lit de mélange.It is known to use an ignition hood under which burners are arranged on either side of the side edges of the mixing bed so as to eject their combustion products horizontally, that is to say parallel to the surface of the mixing bed, so that the flames lick the surface of the mixing bed.

La hotte d'allumage chauffe le lit de mélange par rayonnement des parois sur toute sa largeur et, en la traversant, la surface du lit de mélange atteint progressivement la température de combustion.The ignition hood heats the mixing bed by radiating the walls over its entire width and passing through, the surface of the mixing bed gradually reaches the combustion temperature.

Cependant, comme une flamme de brûleur n'a pas une température homogène sur toute sa longueur et comme deux flammes de brûleurs disposés en vis-à-vis de chaque côté du lit de mélange, se recouvrent au centre du lit de mélange, la température de la surface de celui-ci est hétérogène suivant sa largeur.However, since a burner flame does not have a homogeneous temperature over its entire length and as two burner flames arranged opposite each side of the mixing bed, overlap in the center of the mixing bed, the temperature of the surface thereof is heterogeneous according to its width.

De plus les irrégularités d'épaisseur éventuelles du lit de mélange, conduisent également à une mauvaise répartition de la température à la surface du lit de mélange.In addition, any irregularities in thickness of the mixing bed also lead to a poor distribution of the temperature on the surface of the mixing bed.

On accélère l'allumage et on réalise la propagation de la réaction de combustion en faisant circuler de l'air perpendiculairement à la surface du lit de mélange, l'oxygène de l'air alimentant ainsi la réaction de combustion.The ignition is accelerated and the combustion reaction is propagated by circulating air perpendicular to the surface of the mixing bed, the oxygen in the air thus supplying the combustion reaction.

Le dispositif d'allumage assurant en particulier l'évaporation de l'eau du mélange, il se crée dans le mélange des espaces permettant la circulation d'air.The ignition device ensuring in particular the evaporation of the water from the mixture, it creates spaces in the mixture allowing the circulation of air.

Une température trop élevée du mélange provoque sa vitrification et la perte de sa perméabilité à l'air, empêchant cette circulation d'air. Par contre, une température trop faible du mélange ne permet pas d'obtenir l'agglomération du minerai. Il est donc important d'obtenir une température homogène et bien controlée sur une épaisseur définie, ce que ne réalise pas le dispositif connu.Too high a temperature of the mixture causes its vitrification and the loss of its air permeability, preventing this air circulation. On the other hand, too low a temperature of the mixture does not make it possible to obtain agglomeration of the ore. It is therefore important to obtain a uniform and well-controlled temperature over a defined thickness, which the known device does not achieve.

Par ailleurs, la circulation des gaz chauds qui est perpendiculaire à la surface du lit de mélange est en opposition au mouvement d'éjection des gaz des brûleurs qui se fait parallèlement à la surface du lit de mélange. De cette façon, les flux de gaz des brûleurs au travers du mélange sont hétérogènes.Furthermore, the circulation of the hot gases which is perpendicular to the surface of the mixing bed is in opposition to the movement of ejection of the gases from the burners which takes place parallel to the surface of the mixing bed. In this way, the gas flows from the burners through the mixture are heterogeneous.

Enfin, comme les flammes des brûleurs sont horizontales par rapport à la surface du lit de mélange, elles chauffent inutilement la face interne de la hotte qui se trouve au-dessus d'elles, en augmentant ainsi les pertes thermiques.Finally, as the flames of the burners are horizontal with respect to the surface of the mixing bed, they unnecessarily heat the internal face of the hood which is located above them, thereby increasing the heat losses.

Afin de remédier notamment aux inconvénients d'hétérogénéité de la température suivant la largeur du lit de mélange, de disparité de circulation des flux gazeux et notamment de la distribution d'oxygène et de pertes thermiques, l'invention propose un dispositif d'allumage d'un lit de mélange entraîné en mouvement, notamment d'un mélange comprenant du minerai de fer et du coke dont la combustion produit l'agglomération du minerai, du type comportant une hotte, sous laquelle sont disposés des brûleurs alimentés en combustible et en air, la hotte recouvrant le lit de mélange sur toute sa largeur et sur une longueur adaptée pour chauffer celui-ci jusqu'à la température d'allumage, les brûleurs ayant des axes orientés sensiblement perpendiculairement à la surface du lit de mélange, caractérisé en ce que le débit de combustible et le débit d'air sont réglables séparément et individuellement pour chaque brûleur.In order to remedy in particular the drawbacks of heterogeneity of the temperature along the width of the mixing bed, of disparity of circulation of the gas flows and in particular of the distribution of oxygen and of heat losses, the invention proposes an ignition device d '' a bed of mixture driven in movement, in particular of a mixture comprising iron ore and coke, the combustion of which produces the agglomeration of the ore, of the type comprising a hood, under which are burners supplied with fuel and air , the hood covering the mixing bed over its entire width and over a length suitable for heating it to the ignition temperature, the burners having axes oriented substantially perpendicular to the surface of the mixing bed, characterized in that that the fuel flow and the air flow are adjustable separately and individually for each burner.

Selon d'autres caractéristiques de l'invention:

  • les brûleurs sont disposés en au moins une rangée orientée suivant la largeur du lit de mélange ;
  • chaque rangée de brûleurs est espacée de la suivante d'au plus un mètre ;
  • chaque rangée comporte au moins deux brûleurs par mètre de largeur du lit de mélange ;
  • le combustible des brûleurs est du gaz ;
  • les brûleurs sont du type à vitesse d'éjection de gaz rapide.
According to other characteristics of the invention:
  • the burners are arranged in at least one row oriented along the width of the mixing bed;
  • each row of burners is spaced from the next by at most one meter;
  • each row has at least two burners per meter of width of the mixing bed;
  • the fuel in the burners is gas;
  • the burners are of the rapid gas ejection speed type.

La description qui suit fait apparaître d'autres caractéristiques et avantages de l'invention. Cette description fait référence aux dessins annexés sur lesquels :

  • la figure 1 est une vue schématique en coupe longitudinale d'un dispositif d'allumage selon l'invention ;
  • la figure 2 est une vue schématique à grande échelle en coupe longitudinale d'un lit de mélange où se propage une réaction de combustion.
The following description reveals other characteristics and advantages of the invention. This description refers to the accompanying drawings in which:
  • Figure 1 is a schematic view in longitudinal section of an ignition device according to the invention;
  • Figure 2 is a schematic view on a large scale in longitudinal section of a mixing bed which propagates a combustion reaction.

On voit à la figure 1 un dispositif d'allumage 10 d'un lit de mélange 12 qui se déplace suivant le sens indiqué par les flèches F₁ en étant porté par un convoyeur 13.FIG. 1 shows an ignition device 10 for a mixing bed 12 which moves in the direction indicated by the arrows F₁ while being carried by a conveyor 13.

Le mélange comprend principalement du minerai de fer, du coke dont la combustion apporte l'énergie calorifique nécessaire à l'agglomération du minerai, de l'eau et de la chaux.The mixture mainly comprises iron ore, coke, the combustion of which provides the heat energy necessary for the agglomeration of the ore, water and lime.

Le lit de mélange 12 a, par exemple, une largeur de 5 mètres, une épaisseur de 0,5 à 0,7 mètre et une longueur de 80 mètres, entre le dispositif d'allumage 10 et le broyeur, en rapport avec le temps de propagation de la réaction de combustion dans l'épaisseur du mélange.The mixing bed 12 has, for example, a width of 5 meters, a thickness of 0.5 to 0.7 meters and a length of 80 meters, between the ignition device 10 and the grinder, in relation to time propagation of the combustion reaction in the thickness of the mixture.

Le dispositif d'allumage 10 comprend une hotte 14. La hotte comporte au moins une rangée de brûleurs 16 ayant des axes orientés sensiblement perpendiculairement à la surface du lit de mélange 12.The ignition device 10 comprises a hood 14. The hood comprises at least one row of burners 16 having axes oriented substantially perpendicular to the surface of the mixing bed 12.

Chaque brûleur 16 comprend un corps 17, un conduit d'alimentation en gaz 18 et un conduit d'alimentation en air, non représenté sur les figures pour des raisons de clarté. Un cône d'éjection des gaz chauds 19 est représenté schématiquement par deux traits mixtes sous chaque corps de brûleur.Each burner 16 comprises a body 17, a gas supply duct 18 and an air supply duct, not shown in the figures for reasons of clarity. A hot gas ejection cone 19 is shown diagrammatically by two dashed lines under each burner body.

Dans l'exemple de réalisation représenté, ces brûleurs 16 sont agencés en ligne suivant trois rangées équidistantes espacées d'au plus un mètre, s'étendant sur toute la largeur du lit de mélange 12, un brûleur par rangée étant représenté.In the embodiment shown, these burners 16 are arranged in a line in three equidistant rows spaced at most one meter apart, extending over the entire width of the mixing bed 12, one burner per row being shown.

On utilise de préférence des brûleurs à vitesse d'éjection des gaz rapide, c'est-à-dire supérieure à 80 m/s.Burners are preferably used with a rapid gas ejection speed, that is to say greater than 80 m / s.

Les brûleurs JET à flamme chambrée de la société AUBURTIN, d'une puissance de 300 th/h par brûleur, vérifient cette caractéristique et peuvent être utilisés dans le dispositif selon l'invention.The JET burners with a chambered flame from the AUBURTIN company, with a power of 300 th / h per burner, verify this characteristic and can be used in the device according to the invention.

Dans l'exemple de réalisation représenté, chaque rangée de brûleurs comporte vingt brûleurs du type décrit plus haut, ce qui fait au total soixante brûleurs agencés sous la hotte.In the embodiment shown, each row of burners has twenty burners of the type described above, which makes a total of sixty burners arranged under the hood.

Pour un lit de mélange 12 aux dimensions citées ci-dessus, la mise en fonction d'une seule rangée de brûleurs 16 suffit pour obtenir l'allumage du lit.For a mixing bed 12 with the dimensions mentioned above, the operation of a single row of burners 16 is sufficient to obtain the ignition of the bed.

La hotte 14 est réalisée, par exemple, en matière réfractaire.The hood 14 is made, for example, of refractory material.

Le dispositif d'allumage 10 et le lit de mélange 12 sont portés par un ouvrage de maçonnerie 21.The ignition device 10 and the mixing bed 12 are carried by a masonry structure 21.

La figure 2 illustre la façon dont la réaction de combustion, qui a été initialisée par le dispositif d'allumage 10 à la surface du lit de mélange 12, se propage suivant l'épaisseur de celui-ci, au fur et à mesure qu'il se déplace vers le broyeur.FIG. 2 illustrates the way in which the combustion reaction, which was initiated by the ignition device 10 on the surface of the mixing bed 12, propagates along the thickness of the latter, as it moves towards the crusher.

Trois zones sont délimitées dans le lit de mélange 12. Une première zone 22 correspond à la partie du mélange en combustion, une deuxième zone 24 correspond à l'aggloméré de minerai obtenu après la combustion du mélange, et une troisième zone 26 correspond au mélange n'ayant pas encore réagit.Three zones are delimited in the mixing bed 12. A first zone 22 corresponds to the part of the mixture in combustion, a second zone 24 corresponds to the agglomerate of ore obtained after the combustion of the mixture, and a third zone 26 corresponds to the mixture not yet reacted.

Des fentes 28 sont prévues dans le convoyeur 13, sur toute la longueur où se propage la réaction de combustion, et mettent le lit de mélange en communication avec un dispositif d'aspiration d'air de type connu, non représenté, qui crée un effet de tirage engendrant une circulation d'air suivant les flèches F₂ indiquées sur la figure 2. Cet air, circulant à travers l'épaisseur du lit 12, apporte l'oxygène nécessaire à l'entretien de la réaction de combustion du mélange.Slots 28 are provided in the conveyor 13, over the entire length where the combustion reaction is propagated, and put the mixing bed in communication with an air suction device of known type, not shown, which creates a pulling effect generating an air circulation according to the arrows F₂ indicated in FIG. 2. This air, circulating through the thickness of the bed 12, provides the oxygen necessary for the maintenance of the reaction of combustion of the mixture.

La partie gauche de la figure 2 montre un début de propagation de la réaction de combustion qui a été initialisée à la surface du lit de mélange 12, à la sortie du dispositif d'allumage.The left-hand part of FIG. 2 shows a start of propagation of the combustion reaction which has been initialized on the surface of the mixing bed 12, at the outlet of the ignition device.

La partie droite de la figure 2 montre que la réaction de combustion a atteint la face inférieure du lit de mélange et que le mélange a été transformé en minerai aggloméré destiné à approvisionner le haut-fourneau.The right-hand side of FIG. 2 shows that the combustion reaction has reached the underside of the mixing bed and that the mixture has been transformed into agglomerated ore intended to supply the blast furnace.

Pour un mélange du type précité, la combustion se fait de façon optimale, par exemple, pour une température comprise entre 1100° et 1250°.For a mixture of the aforementioned type, combustion takes place optimally, for example, for a temperature between 1100 ° and 1250 °.

L'obtention d'une température homogène sur une bande faisant la largeur du lit de mélange 12 est indispensable à une bonne propagation de cette réaction de combustion dans l'épaisseur du mélange à la sortie du dispositif d'allumage 10.Obtaining a homogeneous temperature on a strip forming the width of the mixing bed 12 is essential for good propagation of this combustion reaction in the thickness of the mixture at the outlet of the ignition device 10.

Le dispositif selon l'invention permet notamment de maîtriser l'homogénéité de la température d'allumage sur une telle bande.The device according to the invention makes it possible in particular to control the homogeneity of the ignition temperature on such a strip.

En effet, le débit de gaz combustible et le débit de gaz comburant (air) sont réglables séparément et individuellement pour chaque brûleur 16, par des moyens de réglage connus habituellement utilisés, non représentés sur les figures. De plus, chaque brûleur chauffe essentiellement un secteur de la surface du lit de mélange 12 délimité par le cône d'éjection de ses gaz et l'ensemble des brûleurs chauffe autant de secteurs qu'il est nécessaire pour amener le mélange à sa température d'allumage sur toute la largeur du lit.In fact, the flow rate of combustible gas and the flow rate of oxidizing gas (air) are adjustable separately and individually for each burner 16, by known adjustment means usually used, not shown in the figures. In addition, each burner essentially heats a sector of the surface of the mixing bed 12 delimited by the gas ejection cone and all of the burners heats as many sectors as necessary to bring the mixture to its temperature d on the entire width of the bed.

Le réglage individuel du débit des gaz de chaque brûleur 16 permet un contrôle de la température, secteur par secteur, et permet ainsi d'obtenir une température relativement homogène à la surface du lit de mélange 12.The individual adjustment of the gas flow rate of each burner 16 allows temperature control, sector by sector, and thus makes it possible to obtain a relatively uniform temperature at the surface of the mixing bed 12.

Il permet également d'obtenir une température de surface supérieure du mélange comprise entre 1100 et 1250°C pour un épaisseur de mélange comprise entre 0,4 et 0,7 m.It also makes it possible to obtain a higher surface temperature of the mixture of between 1100 and 1250 ° C. for a thickness of mixture of between 0.4 and 0.7 m.

Il permet aussi d'ajuster l'apport d'oxygène pour la combustion du coke.It also makes it possible to adjust the oxygen supply for the combustion of coke.

De plus, cette possibilité de réglage individuel permet d'adapter le chauffage à un lit de mélange dont la section transversale a une épaisseur variable, par exemple dans le cas d'une section en forme de V telle que le lit de mélange soit plus épais au centre que sur ses bords, ou inversement.In addition, this possibility of individual adjustment makes it possible to adapt the heating to a mixing bed whose cross section has a variable thickness, for example in the case of a V-shaped section such that the mixing bed is thicker. in the center only on its edges, or vice versa.

L'éjection des produits de combustion et la circulation des gaz chauds au travers du lit de mélange se font dans la même direction, il n'y a donc pas de perturbation et on optimise ainsi la consommation d'oxygène et de gaz sur les brûleurs. On assure ainsi une température homogène des gaz pénétrant le lit de mélange.The ejection of combustion products and the circulation of hot gases through the mixing bed are in the same direction, so there is no disturbance and thus optimizes the consumption of oxygen and gas on the burners . This ensures a uniform temperature of the gases entering the mixing bed.

De plus, en utilisant des brûleurs 16 du type à vitesse d'éjection des gaz rapide, on apporte une meilleure maîtrise des flux thermiques et gazeux grâce à l'éjection rapide des gaz qui provoque la recirculation des fumées et la constitution sous la hotte d'une zone chaude homogène.In addition, by using burners 16 of the fast gas ejection speed type, better control of the heat and gas flows is provided by the rapid ejection of the gases which causes the recirculation of the fumes and the constitution under the hood d '' a homogeneous hot zone.

L'éjection des gaz se faisant du haut de la hotte 14 vers la surface du lit de mélange 12, il y a moins de pertes de chaleur par la paroi de la hotte 14 que dans le cas d'une disposition horizontale des brûleurs provoquant un échauffement inutile de la hotte.As the gases are ejected from the top of the hood 14 towards the surface of the mixing bed 12, there is less heat loss through the wall of the hood 14 than in the case of a horizontal arrangement of the burners causing a unnecessary heating of the hood.

La meilleure maîtrise des flux thermiques et gazeux qu'apporte le dispositif d'allumage selon l'invention permet de réduire la longueur de la hotte dans une proportion pouvant atteindre, voir dépasser 50%. En effet, l'allumage du lit de mélange est obtenu plus rapidement dans le cas d'un dispositif selon l'invention que dans le cas du dispositif connu décrit au début, à vitesse de déplacement du lit de mélange identique.The better control of heat and gas flows provided by the ignition device according to the invention reduces the length of the hood by up to 50% or more. Indeed, the ignition of the mixing bed is obtained more quickly in the case of a device according to the invention than in the case of the known device described at the start, at the same speed of movement of the mixing bed.

Claims (6)

Dispositif d'allumage (10) d'un lit de mélange (12) entraîné en mouvement, notamment d'un mélange comprenant du minerai de fer et du coke dont la combustion produit l'agglomération du minerai, du type comportant une hotte (14), sous laquelle sont disposés des brûleurs (16) alimentés en combustible et en air, la hotte recouvrant le lit de mélange (12) sur toute sa largeur et sur une longueur adaptée pour chauffer celui-ci jusqu'à la température d'allumage, les brûleurs (16) ayant des axes orientés sensiblement perpendiculairement à la surface du lit de mélange (12), caractérisé en ce que le débit de combustible et le débit d'air sont réglables séparément et individuellement pour chaque brûleur (16).Ignition device (10) of a mixing bed (12) driven in movement, in particular of a mixture comprising iron ore and coke, the combustion of which produces agglomeration of the ore, of the type comprising a hood (14 ), under which are arranged burners (16) supplied with fuel and air, the hood covering the mixing bed (12) over its entire width and over a length suitable for heating it to the ignition temperature , the burners (16) having axes oriented substantially perpendicular to the surface of the mixing bed (12), characterized in that the fuel flow and the air flow are adjustable separately and individually for each burner (16). Dispositif selon la revendication 1, caractérisé en ce que les brûleurs (16) sont disposés en au moins une rangée orientée suivant la largeur du lit de mélange (12).Device according to claim 1, characterized in that the burners (16) are arranged in at least one row oriented along the width of the mixing bed (12). Dispositif selon la revendication 2, caractérisé en ce que chaque rangée de brûleurs (16) est espacée de la suivante d'au plus un mètre.Device according to claim 2, characterized in that each row of burners (16) is spaced from the next by at most one meter. Dispositif selon la revendication 2 ou 3, caractérisé en ce que chaque rangée comporte au moins deux brûleurs (16) par mètre de large du lit de mélange (12).Device according to claim 2 or 3, characterized in that each row comprises at least two burners (16) per meter wide of the mixing bed (12). Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le combustible des brûleurs (16) est du gaz.Device according to any one of the preceding claims, characterized in that the fuel of the burners (16) is gas. Dispositif selon la revendication 5, caractérisé en ce que les brûleurs (16) sont du type à vitesse d'éjection de gaz rapide.Device according to claim 5, characterized in that the burners (16) are of the fast gas ejection speed type.
EP91403348A 1990-12-20 1991-12-10 Apparatus for igniting a bed of mixed materials such as mineral and coke Withdrawn EP0493994A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR909016034A FR2670801B1 (en) 1990-12-20 1990-12-20 DEVICE FOR LIGHTING A BED OF MIXTURE OF MATERIALS SUCH AS ORE AND COKE.
FR9016034 1990-12-20

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EP0493994A1 true EP0493994A1 (en) 1992-07-08

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US (1) US5257804A (en)
EP (1) EP0493994A1 (en)
KR (1) KR920012462A (en)
CN (1) CN1063717A (en)
BR (1) BR9105475A (en)
CS (1) CS392391A3 (en)
FR (1) FR2670801B1 (en)
HU (1) HU210661B (en)
PL (1) PL292841A1 (en)
YU (1) YU47817B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA008155B1 (en) * 2004-08-12 2007-04-27 Общество С Ограниченной Ответственностью Научно-Производственная Фирма "Горелочный Центр" Method for igniting sintering mixture transportable on sintering trolleys

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2371975B1 (en) * 2008-12-03 2018-07-11 JFE Steel Corporation Process for producing sintered ore and sintering apparatus

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR482875A (en) * 1916-09-13 1917-05-02 Metallurg Company Of America Improvements made to ignition ovens for grilling devices
FR1274487A (en) * 1960-08-10 1961-10-27 Basse Sambre Sa Etudes Rech S Heating device for ore agglomeration devices
FR1397409A (en) * 1964-03-18 1965-04-30 Penarroya Miniere Metall Process for roasting or agglomeration of sulfur concentrates and reversible ovens for the implementation of said process
US3779077A (en) * 1972-04-10 1973-12-18 Siderurgie Fse Inst Rech Method and apparatus for establishing the firing temperature curve of a sintering charge
FR2347445A1 (en) * 1976-04-09 1977-11-04 Sacilor PROCESS AND INSTALLATION OF IGNITION OF AGGLOMERATION CHAIN
EP0036609A1 (en) * 1980-03-21 1981-09-30 Ruhrgas Aktiengesellschaft Process and installation for the ignition of a sinter mixture
EP0126948A1 (en) * 1983-04-28 1984-12-05 Kawasaki Steel Corporation Burner for sintering machine
EP0221797A1 (en) * 1985-09-30 1987-05-13 Stein Heurtey Ignition process of an ore bed at its sintering

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR482875A (en) * 1916-09-13 1917-05-02 Metallurg Company Of America Improvements made to ignition ovens for grilling devices
FR1274487A (en) * 1960-08-10 1961-10-27 Basse Sambre Sa Etudes Rech S Heating device for ore agglomeration devices
FR1397409A (en) * 1964-03-18 1965-04-30 Penarroya Miniere Metall Process for roasting or agglomeration of sulfur concentrates and reversible ovens for the implementation of said process
US3779077A (en) * 1972-04-10 1973-12-18 Siderurgie Fse Inst Rech Method and apparatus for establishing the firing temperature curve of a sintering charge
FR2347445A1 (en) * 1976-04-09 1977-11-04 Sacilor PROCESS AND INSTALLATION OF IGNITION OF AGGLOMERATION CHAIN
EP0036609A1 (en) * 1980-03-21 1981-09-30 Ruhrgas Aktiengesellschaft Process and installation for the ignition of a sinter mixture
EP0126948A1 (en) * 1983-04-28 1984-12-05 Kawasaki Steel Corporation Burner for sintering machine
EP0221797A1 (en) * 1985-09-30 1987-05-13 Stein Heurtey Ignition process of an ore bed at its sintering

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA008155B1 (en) * 2004-08-12 2007-04-27 Общество С Ограниченной Ответственностью Научно-Производственная Фирма "Горелочный Центр" Method for igniting sintering mixture transportable on sintering trolleys

Also Published As

Publication number Publication date
HU210661B (en) 1995-06-28
FR2670801A1 (en) 1992-06-26
YU195191A (en) 1994-01-20
HUT61841A (en) 1993-03-01
CN1063717A (en) 1992-08-19
KR920012462A (en) 1992-07-27
PL292841A1 (en) 1992-11-16
CS392391A3 (en) 1992-07-15
US5257804A (en) 1993-11-02
HU914034D0 (en) 1992-03-30
YU47817B (en) 1996-01-09
FR2670801B1 (en) 1994-07-01
BR9105475A (en) 1992-09-01

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